# 4.13
buffet_menus = ('beef noodles','rockfish sandwich','smoked salmon chowder'
                ,'salmon burger','crab cakes')
print('You can choose from the following menu items:')
for menu in buffet_menus:
    print(f"-{menu}")

# 错误示范
# buffet_menus[0]='king crab legs'

print('\nOur menu has been updated.\n' \
'You can now choose from the following items:')
buffet_menus = ('rockfish sandwich', 'halibut nuggets', 'smoked salmon chowder'
                ,'black cod tips','king crab legs')
for menu in buffet_menus:
    print(f"-{menu}")